It is estimated that approximately 25% of patients undergoing PCI have significant postprocedural creatinine kinase (CK)/creatinine kinase myocardial band (CK-MB) elevations and approximately 50% of patients have significant post-procedural troponin elevations. The most common complication of PCI is a cell damage to cardiomyocyte that can be diagnosed by postprocedure elevation of cardiac markers. N-acetylcystein have several positive effect on platelet and vascular function and infarct size.